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Trying to explain it in a way that makes sense.

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[[folder:Web Original]]
* At the end of ''Literature/FunnyBusiness'', when Jeanette learns that her RealityWarper powers are a result of her being the only real entity in the universe, and everybody else is but a figment of her imagination, and hence there is no reason for her depression and self-hatred, and everything she will ever do is completely pointless because nobody else exists to be affected by it, she eventually decides that the only way to deal with this is to {{Depower}} herself permanently and erase all of her memory of ever having had her powers to begin with. Because of how this universe’s cosmology works, this causes the world to spontaneously be recreated into one where other people indeed exist, Jeanette is a normal kid, and nothing in the story ever happened.
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[[folder:Video Game]]

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[[folder:Video Game]]Games]]



* The plot of ''VideoGame/BioShockInfinite'' is driven by the conflict of the PlayerCharacter Booker [=DeWitt=] and the BigBad Zachary Comstock over Comstock's daughter Elizabeth and her DimensionalTraveler powers. Towards the end of the game, it is revealed that Comstock is actually Booker himself who, in an alternate timeline, has had a religious conversion and changed his name, while Elizabeth was originally the player-controlled Booker's daughter Anna, who was taken to another dimension as a baby. After Elizabeth's power manifests fully, she realizes that the number of timelines is infinite and Booker becomes Comstock in about a half of them, so the only way to put an end to this conflict is by killing him just before the Comstock-Booker bifurcation occurs, effectively preventing the entire plot of the game from ever occurring, which she does with Booker's consent.



* In ''the WesternAnimation/JusticeLeague'' episode "[[Recap/JusticeLeagueUnlimitedS1E13TimeWarped Time, Warped]]", Franchise/{{Batman}} tampers with the villain's time travel belt so that instead of going on his time traveling crime spree, as he did at the beginning of the previous episode, it locks him in a time loop at the point where he would have started.

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* In ''the WesternAnimation/JusticeLeague'' the ''WesternAnimation/JusticeLeague'' episode "[[Recap/JusticeLeagueUnlimitedS1E13TimeWarped Time, Warped]]", Franchise/{{Batman}} tampers with the villain's time travel belt so that instead of going on his time traveling crime spree, as he did at the beginning of the previous episode, it locks him in a time loop at the point where he would have started.
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* In ''Series/LegendsOfTomorrow'' Season 2, after the Legends spend most of the season trying to keep the Spear of Destiny out of the hands of the LegionOfDoom, ultimately they fail and the Legion uses the Spear to rewrite reality. Even trapped within the Legion's Doomworld reality, the Legends make a final attempt to steal back the spear and undo the damage, only for Eobard Thawne to destroy the spear itself. The Legends then reason that the only way to repair reality is to stop the Legion from getting the Spear to begin with, so they travel back in time across their own personal history to UsefulNotes/WorldWarI where the Legion had first acquired the completed Spear. In a FinalBattle of the Legends teaming up with their past selves to face the Legion, all of the future Legends end up being killed with the exception of Sara. Sara then uses the Spear's reality powers to disable its own reality warping ''before'' the Legion would use it, thus preventing the Legion from ever creating the Doomworld to begin with and restoring reality to its correct nature.

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* In ''Series/LegendsOfTomorrow'' Season 2, after the Legends spend most of the season trying to keep the Spear of Destiny TheSpearOfDestiny out of the hands of the LegionOfDoom, ultimately they fail and the Legion uses the Spear to rewrite reality. Even trapped within the Legion's Doomworld reality, the Legends make a final attempt to steal back the spear and undo the damage, only for Eobard Thawne to destroy the spear itself. The Legends then reason that the only way to repair reality is to stop the Legion from getting the Spear to begin with, so they travel back in time across their own personal history to UsefulNotes/WorldWarI where the Legion had first acquired the completed Spear. In a FinalBattle of the Legends teaming up with their past selves to face the Legion, all of the future Legends end up being killed with the exception of Sara. Sara then uses the Spear's reality powers to disable its own reality warping ''before'' the Legion would use it, thus preventing the Legion from ever creating the Doomworld to begin with and restoring reality to its correct nature.

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This can be treated as utterly tragic, since it undoes CharacterDevelopment, and may even be a sadistic choice (the "nail" in question is often some sort of tragedy, such as the protagonist's death). Other times it has a slightly more optimistic spin, with it being implied that some of the nicer events that transpired will take place InSpiteOfANail (a slightly awkward scene of the main character befriending a character, especially a LoveInterest, who they no longer know is a popular one). In worse cases, it might even be AllForNothing, with it implied that the catastrophe that was averted could easily happen again (and the next people to experience it might be more selfish).

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This can be treated as utterly tragic, since it undoes CharacterDevelopment, and may even be a sadistic choice (the "nail" in question is often some sort of tragedy, such as the protagonist's death).death, or [[ShootTheDog an innocent party they now have to personally harm]]). Other times it has a slightly more optimistic spin, with it being implied that some of the nicer events that transpired will take place InSpiteOfANail (a slightly awkward scene of the main character befriending a character, especially a LoveInterest, who they no longer know is a popular one). In worse cases, it might even be AllForNothing, with it implied that the catastrophe that was averted could easily happen again (and the next people to experience it might be more selfish).



** In [[Recap/FuturamaS2E16AnthologyOfInterestI "Anthology of Interest I"]], Fry asks the "WhatIf" Machine what would have happened if he hadn't been cryogenically frozen in 1999--that is, if the entire premise of the show were undone. Turns out this would cause a TimeParadox--because the future ''needs'' Fry for an unexplained reason--and this damage to the timeline attracts the attention of UsefulNotes/AlGore and the Vice Presidential Action Squad. When they figure out that Fry ''needs'' to get frozen to save the timeline, Fry disbelieves them and breaks the freezer. The temporal paradox then implodes the entire universe--stranding Fry and the rest in a white void, with nothing to do but play play ''TabletopGame/DungeonsAndDragons'' for the rest of eternity.

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** In [[Recap/FuturamaS2E16AnthologyOfInterestI "Anthology of Interest I"]], Fry asks the "WhatIf" Machine what would have happened if he hadn't been cryogenically frozen in 1999--that is, if the entire premise of the show were undone. Turns out this would cause a TimeParadox--because the future ''needs'' Fry for an unexplained reason--and this damage to the timeline attracts the attention of UsefulNotes/AlGore and the Vice Presidential Action Squad. When they figure out that Fry ''needs'' to get frozen to save the timeline, Fry disbelieves them and breaks the freezer. The temporal paradox then implodes the entire universe--stranding Fry and the rest in a white void, with nothing to do but play play ''TabletopGame/DungeonsAndDragons'' for the rest of eternity. Examples of the trope which tend to be a ShootTheDog are also briefly parodied when Al Gore et al assume Fry was supposed to die, and get confused when trying to murder him doesn't fix anything.
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* In ''the WesternAnimation/JusticeLeague'' episode "[[Recap/JusticeLeagueUnlimitedS1E13TimeWarped Time, Warped]]", Batman tampers with the villain's time travel belt so that instead of going on his time traveling crime spree, as he did at the beginning of the previous episode, it locks him in a time loop at the point where he would have started.

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* In ''the WesternAnimation/JusticeLeague'' episode "[[Recap/JusticeLeagueUnlimitedS1E13TimeWarped Time, Warped]]", Batman Franchise/{{Batman}} tampers with the villain's time travel belt so that instead of going on his time traveling crime spree, as he did at the beginning of the previous episode, it locks him in a time loop at the point where he would have started.
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** In [[Recap/FuturamaS2E16AnthologyOfInterestI "Anthology of Interest I"]], Fry asks the "WhatIf" Machine what would have happened if he hadn't been cryogenically frozen in 1999--that is, if the entire premise of the show were undone. Turns out this would cause a TimeParadox--because the future ''needs'' Fry for an unexplained reason--and this damage to the timeline attracts the attention of Al Gore and the Vice Presidential Action Squad. When they figure out that Fry ''needs'' to get frozen to save the timeline, Fry disbelieves them and breaks the freezer. The temporal paradox then implodes the entire universe--stranding Fry and the rest in a white void, with nothing to do but play play ''TabletopGame/DungeonsAndDragons'' for the rest of eternity.

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** In [[Recap/FuturamaS2E16AnthologyOfInterestI "Anthology of Interest I"]], Fry asks the "WhatIf" Machine what would have happened if he hadn't been cryogenically frozen in 1999--that is, if the entire premise of the show were undone. Turns out this would cause a TimeParadox--because the future ''needs'' Fry for an unexplained reason--and this damage to the timeline attracts the attention of Al Gore UsefulNotes/AlGore and the Vice Presidential Action Squad. When they figure out that Fry ''needs'' to get frozen to save the timeline, Fry disbelieves them and breaks the freezer. The temporal paradox then implodes the entire universe--stranding Fry and the rest in a white void, with nothing to do but play play ''TabletopGame/DungeonsAndDragons'' for the rest of eternity.
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** Max realises she can jump back in time via photos (as well as just reversing it briefly as is done in normal gameplay) and tries to fix the death of Chloe's [[GoodParents near angelic father]]. In the new timeline Chloe suffered a car accident instead and is dying a slow, painful death while confined to a wheelchair, suffering many of the bad things that were previously caused by her father's death[[note]]kicked out of school because they can't accommodate her rather than delinquency, the family are on the verge of poverty because of medical bills despite her father's job, Max still moved away (and seems socially isolated at school as an AlphaBitch instead of a wallflower) and all the mysterious events they were investigating -- including the random death of animals, freak weather events and the disappearance of Rachel (who Chloe never met) -- are still happening[[/note]], culminating in a choice of whether you [[ICannotSelfTerminate kill her with an overdose]] at her own request, or not. This is finally enough to make Max restore the original timeline, where Chloe is miserable and went through hell for the last 5 years, but still alive. The entire scene is effectively foreshadowing for the endings...

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** Max realises she can jump back in time via photos (as well as just reversing it briefly as is done in normal gameplay) and tries to fix the death of Chloe's [[GoodParents near angelic father]]. In the new timeline Chloe suffered a car accident instead and is dying a slow, painful death while confined to a wheelchair, suffering many of the bad things that were previously caused by her father's death[[note]]kicked out of school because they can't accommodate her rather than delinquency, the family are on the verge of poverty because of medical bills despite her father's job, Max still moved away (and seems socially isolated at school as an AlphaBitch instead of a wallflower) and all the mysterious events they were investigating -- including the random death of animals, freak weather events and the disappearance of Rachel (who Chloe never met) -- are still happening[[/note]], culminating in a choice of whether you [[ICannotSelfTerminate kill her with an overdose]] at her own request, or not. This is finally enough to make Max restore the original timeline, where Chloe is miserable and went through hell for the last 5 years, but is still alive. The entire scene is effectively foreshadowing {{foreshadowing}} for the endings...
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** In the [[Recap/DoctorWHoNSS3E12TheSoundOfDrums two]]-[[Recap/DoctorWhoNSS3E13LastOfTheTimeLords parter]] finale of Series 3 of the revival. [[ArchEnemy The Master]] had [[TheBadGuyWins succeeded]] in taking control over the entire world, trapping the Doctor in a rapid ageing state, and Martha Jones on the run on the ground. The Master accomplished this by using a psychic MindControlDevice to gradually work his way into being elected Prime Minister of Britain, before using an army of Toclafane (cyborg future human he had transported to the present) to cease control of the whole world. The Master would spend a year having his army gradually killing off the population of Earth, which was a TemporalParadox since they were killing their ancestors. This is only made possible due to the Master turning the Doctor's TARDIS into a paradox machine. The Doctor ultimately manages to defeat the Master, by having Martha travel the Earth to every human survivor (linked with the Master's psychic device) and have them [[WordPower all think his name in unison]], allowing the psychic energies to be [[EmpoweredBadassNormal granted to him]]. Once the Master is out of the way, the paradox machine is destroyed, causing the entire year of the Master's reign to reset back to before the paradox machine was activated. Only the select few people present near the machine retained memories of the year, while the rest of the population of the Earth were unaware of it occurring. This year came to be known as "The Year That Never Was".

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** In the [[Recap/DoctorWHoNSS3E12TheSoundOfDrums two]]-[[Recap/DoctorWhoNSS3E13LastOfTheTimeLords parter]] finale of Series 3 of the revival. [[ArchEnemy The Master]] had [[TheBadGuyWins succeeded]] in taking control over the entire world, trapping the Doctor in a rapid ageing RapidAging state, and Martha Jones on the run on the ground. The Master accomplished this by using a psychic MindControlDevice to gradually work his way into being elected Prime Minister of Britain, before using an army of Toclafane (cyborg future human he had transported to the present) to cease control of the whole world. The Master would spend a year having his army gradually killing off the population of Earth, which was a TemporalParadox since they were killing their ancestors. This is only made possible due to the Master turning the Doctor's TARDIS into a paradox machine. The Doctor ultimately manages to defeat the Master, by having Martha travel the Earth to every human survivor (linked with the Master's psychic device) and have them [[WordPower all think his name in unison]], allowing the psychic energies to be [[EmpoweredBadassNormal granted to him]]. Once the Master is out of the way, the paradox machine is destroyed, causing the entire year of the Master's reign to reset back to before the paradox machine was activated. Only the select few people present near the machine retained memories of the year, while the rest of the population of the Earth were unaware of it occurring. This year came to be known as "The Year That Never Was".
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* In ''Series/LegendsOfTomorrow'' Season 2, after the Legends spend most of the season trying to keep the Spear of Destiny out of the hands of the LegionOfDoom, ultimately they fail and the Legion uses the Spear to rewrite reality. Even trapped within the Legion's Doomworld reality, the Legends make a final attempt to steal back the spear and undo the damage, only for Eobard Thawne to destroy the spear itself. The Legends then reason that the only way to repair reality is to stop the Legion from getting the Spear to begin with, so they travel back in time across their own personal history to WWI where the Legion had first acquired the completed Spear. In a FinalBattle of the Legends teaming up with their past selves to face the Legion, all of the future Legends end up being killed with the exception of Sara. Sara then uses the Spear's reality powers to disable its own reality warping ''before'' the Legion would use it, thus preventing the Legion from ever creating the Doomworld to begin with and restoring reality to its correct nature.

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* In ''Series/LegendsOfTomorrow'' Season 2, after the Legends spend most of the season trying to keep the Spear of Destiny out of the hands of the LegionOfDoom, ultimately they fail and the Legion uses the Spear to rewrite reality. Even trapped within the Legion's Doomworld reality, the Legends make a final attempt to steal back the spear and undo the damage, only for Eobard Thawne to destroy the spear itself. The Legends then reason that the only way to repair reality is to stop the Legion from getting the Spear to begin with, so they travel back in time across their own personal history to WWI UsefulNotes/WorldWarI where the Legion had first acquired the completed Spear. In a FinalBattle of the Legends teaming up with their past selves to face the Legion, all of the future Legends end up being killed with the exception of Sara. Sara then uses the Spear's reality powers to disable its own reality warping ''before'' the Legion would use it, thus preventing the Legion from ever creating the Doomworld to begin with and restoring reality to its correct nature.
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* The ''Series/StarTrekTheOriginalSeries'' episode [[Recap/StarTrekS1E28TheCityOnTheEdgeOfForever "City on the Edge of Forever"]] ends with this trope {{implied|trope}}. When [=McCoy=] gets drugged and falls through a mysterious portal through time, his changes to the timeline cause the ''Enterprise'' to disappear from the present. Kirk and Spock follow [=McCoy=] into the portal, arriving in UsefulNotes/NewYorkCity in TheThirties. They meet the peace activist Edith Keeler, and soon realize that she's the change in the timeline. [=McCoy=] saved her (or [[TimeTravelTenseTrouble will soon save her]]) from an early death, and her activism will delay the USA's entry into WWII just long enough to lead to a BadFuture. So Kirk prevents [=McCoy=] from rescuing Keeler--erasing [=McCoy's=] involvement in the past and restoring the timeline to normal.

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* The ''Series/StarTrekTheOriginalSeries'' episode [[Recap/StarTrekS1E28TheCityOnTheEdgeOfForever "City on the Edge of Forever"]] ends with this trope {{implied|trope}}. When [=McCoy=] gets drugged and falls through a mysterious portal through time, his changes to the timeline cause the ''Enterprise'' to disappear from the present. Kirk and Spock follow [=McCoy=] into the portal, arriving in UsefulNotes/NewYorkCity in TheThirties. They meet the peace activist Edith Keeler, and soon realize that she's the change in the timeline. [=McCoy=] saved her (or [[TimeTravelTenseTrouble will soon save her]]) from an early death, and her activism will delay the USA's entry into WWII UsefulNotes/WorldWarII just long enough to lead to a BadFuture.BadFuture where UsefulNotes/NaziGermany wins. So Kirk prevents [=McCoy=] from rescuing Keeler--erasing [=McCoy's=] involvement in the past and restoring the timeline to normal.
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* The ''Series/StarTrekTheOriginalSeries'' episode [[Recap/StarTrekS1E28TheCityOnTheEdgeOfForever "City on the Edge of Forever"]] ends with this trope {{implied|trope}}. When [=McCoy=] gets drugged and falls through a mysterious portal through time, his changes to the timeline cause the ''Enterprise'' to disappear from the present. Kirk and Spock follow [=McCoy=] into the portal, arriving in New York City in the '30s. They meet the peace activist Edith Keeler, and soon realize that she's the change in the timeline. [=McCoy=] saved her (or [[TimeTravelTenseTrouble will soon save her]]) from an early death, and her activism will delay the USA's entry into WWII just long enough to lead to a BadFuture. So Kirk prevents [=McCoy=] from rescuing Keeler--erasing [=McCoy's=] involvement in the past and restoring the timeline to normal.

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* The ''Series/StarTrekTheOriginalSeries'' episode [[Recap/StarTrekS1E28TheCityOnTheEdgeOfForever "City on the Edge of Forever"]] ends with this trope {{implied|trope}}. When [=McCoy=] gets drugged and falls through a mysterious portal through time, his changes to the timeline cause the ''Enterprise'' to disappear from the present. Kirk and Spock follow [=McCoy=] into the portal, arriving in New York City UsefulNotes/NewYorkCity in the '30s.TheThirties. They meet the peace activist Edith Keeler, and soon realize that she's the change in the timeline. [=McCoy=] saved her (or [[TimeTravelTenseTrouble will soon save her]]) from an early death, and her activism will delay the USA's entry into WWII just long enough to lead to a BadFuture. So Kirk prevents [=McCoy=] from rescuing Keeler--erasing [=McCoy's=] involvement in the past and restoring the timeline to normal.
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* Lewis Robinson of Disney's ''Disney/MeetTheRobinsons'' discovers the far future is an ugly {{dystopia}} where humanity is a SlaveRace to mechanized overlords. Learning that it's one of his inventions that went rogue and begat this dystopia, Lewis gives a DeathGlare to the CyberCyclops BigBad and delivers the scathing PreMortemOneLiner "... and I'm not inventing you!" Whereupon the device dissolves from existence, just before Lewis exploits the TimeyWimeyBall to SetRightWhatOnceWentWrong.

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* Lewis Robinson of Disney's ''Disney/MeetTheRobinsons'' discovers the far future is an ugly [[BadFuture ugly]] {{dystopia}} where humanity is a SlaveRace to mechanized overlords. Learning that it's one of his inventions that went rogue and begat this dystopia, Lewis gives a DeathGlare to the CyberCyclops BigBad and delivers the scathing PreMortemOneLiner "... and I'm not inventing you!" Whereupon the device dissolves from existence, just before Lewis exploits the TimeyWimeyBall to SetRightWhatOnceWentWrong.
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* ''[[https://www.fimfiction.net/story/348928/quantum-starlight Quantum Starlight]]'' (a ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fanfic and WholePlotReference to ''VideoGame/QuantumBreak''): an accident during the first test of a time machine causes time itself to fracture, leading to a whole mess of unchangeable {{Stable Time Loop}}s and the looming threat of a TimeCrash. And then the protagonists find a method of time travel that ''does'' allow them to change the past, so they go back and stop the original accident. The majority of the plot is erased from the timeline, but the time travelers retain their memories of events retconned away.

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* ''[[https://www.fimfiction.net/story/348928/quantum-starlight Quantum Starlight]]'' (a ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fanfic and WholePlotReference to ''VideoGame/QuantumBreak''): an accident during the first test of a time machine TimeMachine causes time itself to fracture, leading to a whole mess of unchangeable {{Stable Time Loop}}s and the looming threat of a TimeCrash. And then the protagonists find a method of time travel that ''does'' allow them to change the past, so they go back and stop the original accident. The majority of the plot is erased from the timeline, but the time travelers [[RippleEffectProofMemory retain their memories memories]] of events retconned {{retcon}}ned away.
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* In ''ComicBook/TheInfinityGauntlet'' saga, ComicBook/{{Thanos}} managed to get the Infinity Gauntlet, a powerful AppliedPhlebotinum that can modify everything, so he erased the half of sentient life of the universe to please Ms. Death, among other things like defeating the Cosmic Entities of the ComicBook/MarvelUniverse. After the battle against the Mad God, finally Adam Warlock got the infinity Gauntlet from Thanos and used to SetRightWhatOnceWentWrong by restoring all the lifes lost in the event (not just the ones erased by Thanos, also the deaths of heroes battling Thanos) and also managed to get everyone in the universe that was AllJustADream.

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* In ''ComicBook/TheInfinityGauntlet'' saga, ComicBook/{{Thanos}} managed to get the Infinity Gauntlet, a powerful AppliedPhlebotinum that can modify everything, so he erased the half of sentient life of the universe to please Ms. Death, among other things like defeating the Cosmic Entities of the ComicBook/MarvelUniverse. After the battle against the Mad God, MadGod, finally Adam Warlock ComicBook/AdamWarlock got the infinity Gauntlet from Thanos and used to SetRightWhatOnceWentWrong by restoring all the lifes lives lost in the event (not just the ones erased by Thanos, also the deaths of heroes battling Thanos) and also managed to get convince everyone in the universe that it was AllJustADream.
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* As well as referencing the Star Trek example (as seen in the page quote), ''VideoGame/LifeIsStrange'' has this twice itself; at the beginning of chapter 4, and for the entire game.

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* As well as referencing the Star Trek ''Star Trek'' example (as seen in the page quote), ''VideoGame/LifeIsStrange'' has this twice itself; at the beginning of chapter 4, and for the entire game.
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->''"I remember this famous episode of the original Star Trek, where Kirk has to go back in time and let the person he loves die, so the Nazis won't win the war... What kind of fucked up choice is that?"''

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->''"I remember this famous episode of the original Star Trek, ''Star Trek'', where Kirk has to go back in time and let the person he loves die, so the Nazis won't win the war... What kind of fucked up choice is that?"''
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* ''Film/TheDevilsAdvocate'': The movie ends with Kevin Lomax deciding to screw fate and killing himself to destroy the Devil's plans for world conquest. Then he suddenly finds himself back at the courthouse at the start of the movie before he made the decision that would lead to him meeting and ultimately working for the Devil. He chooses differently this time, thus undoing all the film's events, but it turns out that the Devil is still watching him anyway...

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Alphabetization.


[[folder:Film -- Animated]]
* Lewis Robinson of Disney's ''Disney/MeetTheRobinsons'' discovers the far future is an ugly {{dystopia}} where humanity is a SlaveRace to mechanized overlords. Learning that it's one of his inventions that went rogue and begat this dystopia, Lewis gives a DeathGlare to the CyberCyclops BigBad and delivers the scathing PreMortemOneLiner "... and I'm not inventing you!" Whereupon the device dissolves from existence, just before Lewis exploits the TimeyWimeyBall to SetRightWhatOnceWentWrong.
[[/folder]]



[[folder:Film -- Animated]]
* Lewis Robinson of Disney's ''Disney/MeetTheRobinsons'' discovers the far future is an ugly {{dystopia}} where humanity is a SlaveRace to mechanized overlords. Learning that it's one of his inventions that went rogue and begat this dystopia, Lewis gives a DeathGlare to the CyberCyclops BigBad and delivers the scathing PreMortemOneLiner "... and I'm not inventing you!" Whereupon the device dissolves from existence, just before Lewis exploits the TimeyWimeyBall to SetRightWhatOnceWentWrong.
[[/folder]]
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Compare SetRightWhatOnceWentWrong, where undoing a specific event is the overall goal (which might lead to this trope), TheGreatestStoryNeverTold (which happened, but was simply kept secret) and ResetButtonEnding, which returns the work to its {{Status Quo|IsGod}} without resolving the conflict on its own (and doesn't always include altering history). Contrast AllJustADream, where the events are revealed to simply never have happened, LeaveYourQuestTest where undoing everything would be seen as a copout on the heroes' part, and StableTimeLoop, where changes to the timeline are either inevitable or meshed in perfectly (although it's still possible to run into the "bad outweighs the good" problem).

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Compare SetRightWhatOnceWentWrong, where undoing a specific event is the overall goal (which might lead to this trope), TheGreatestStoryNeverTold (which happened, but was simply kept secret) secret), VictoryGuidedAmnesia (the events happened, but memories of them were erased) and ResetButtonEnding, which returns the work to its {{Status Quo|IsGod}} without resolving the conflict on its own (and doesn't always include altering history). Contrast AllJustADream, where the events are revealed to simply never have happened, LeaveYourQuestTest where undoing everything would be seen as a copout on the heroes' part, and StableTimeLoop, where changes to the timeline are either inevitable or meshed in perfectly (although it's still possible to run into the "bad outweighs the good" problem).
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Not what a Cosmic Retcon is.


Compare SetRightWhatOnceWentWrong, where undoing a specific event is the overall goal (which might lead to this trope), TheGreatestStoryNeverTold (which happened, but was simply kept secret) and ResetButtonEnding, which returns the work to its {{Status Quo|IsGod}} without resolving the conflict on its own (and doesn't always include a CosmicRetcon). Contrast AllJustADream, where the events are revealed to simply never have happened, LeaveYourQuestTest where undoing everything would be seen as a copout on the heroes' part, and StableTimeLoop, where changes to the timeline are either inevitable or meshed in perfectly (although it's still possible to run into the "bad outweighs the good" problem).

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Compare SetRightWhatOnceWentWrong, where undoing a specific event is the overall goal (which might lead to this trope), TheGreatestStoryNeverTold (which happened, but was simply kept secret) and ResetButtonEnding, which returns the work to its {{Status Quo|IsGod}} without resolving the conflict on its own (and doesn't always include a CosmicRetcon).altering history). Contrast AllJustADream, where the events are revealed to simply never have happened, LeaveYourQuestTest where undoing everything would be seen as a copout on the heroes' part, and StableTimeLoop, where changes to the timeline are either inevitable or meshed in perfectly (although it's still possible to run into the "bad outweighs the good" problem).



* In the ''WesternAnimation/FamilyGuy'' episode "Back to the Pilot", Brian asks for Stewie's help in finding a lost tennis ball. Stewie agrees to take Brian back in time so he can see the location, but Brian fails to listen ends up telling his past self about the 9/11 attacks. This results in an apocalyptic BadFuture from the result of nuclear attacks. After multiple trips result in [[MesACrowd dozens of Stewies and Brians]] from the future arguing it out on whether or not to prevent 9/11, one of the Stewies decides to hold a vote. Upon the majority agreeing to allow 9/11 to happen, this Stewie and Brian then travel one minute back in time to the very first point they arrived via time travel, before they made ''any'' changes. Stewie then draws a gun on the past Stewie and Brian and forces them to go back to the present. By doing so, Stewie managed to [[CosmicRetcon erase the entire timeline]] created by the time travel along with this version of Brian and Stewie.

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* In the ''WesternAnimation/FamilyGuy'' episode "Back to the Pilot", Brian asks for Stewie's help in finding a lost tennis ball. Stewie agrees to take Brian back in time so he can see the location, but Brian fails to listen ends up telling his past self about the 9/11 attacks. This results in an apocalyptic BadFuture from the result of nuclear attacks. After multiple trips result in [[MesACrowd dozens of Stewies and Brians]] from the future arguing it out on whether or not to prevent 9/11, one of the Stewies decides to hold a vote. Upon the majority agreeing to allow 9/11 to happen, this Stewie and Brian then travel one minute back in time to the very first point they arrived via time travel, before they made ''any'' changes. Stewie then draws a gun on the past Stewie and Brian and forces them to go back to the present. By doing so, Stewie managed to [[CosmicRetcon erase the entire timeline]] timeline created by the time travel along with this version of Brian and Stewie.
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Sometimes the protagonist will wake up and find out that it was AllJustADream. This is a slightly darker take that shows up in speculative fiction that deals with TimeTravel, {{Reality Warp|er}}ing and alternate realities; the events really took place, but some key ForWantOfANail near the beginning [[CosmicRetcon must be undone]] to resolve the plot's key conflict. It could be the solution to ending a GroundhogDayLoop (as opposed to getting the loop perfect), a matter of realising that a single trip was a case of MakeWrongWhatOnceWentRight, or it could just be a case of the option to RetGone everything coming up in the finale. Reasons can include BalancingDeathsBooks, preventing a TimeParadox, or simply discovering that the unintended consequences of the event in question outweigh the good it does. More often than not, the event in question is the same one that brought about said conflict, making this an odd sort of CuttingTheKnot solution.

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Sometimes the protagonist will wake up and find out that it was AllJustADream. This is a slightly darker take that shows up in speculative fiction that deals with TimeTravel, {{Reality Warp|er}}ing and alternate realities; the events really took place, but some key ForWantOfANail near the beginning [[CosmicRetcon [[SetRightWhatOnceWasWrong must be undone]] to resolve the plot's key conflict. It could be the solution to ending a GroundhogDayLoop (as opposed to getting the loop perfect), a matter of realising that a single trip was a case of MakeWrongWhatOnceWentRight, or it could just be a case of the option to RetGone everything coming up in the finale. Reasons can include BalancingDeathsBooks, preventing a TimeParadox, or simply discovering that the unintended consequences of the event in question outweigh the good it does. More often than not, the event in question is the same one that brought about said conflict, making this an odd sort of CuttingTheKnot solution.
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* In ''Film/EdgeOfTomorrow'', Major William Cage is stuck in a GroundhogDayLoop, where every time he dies fighting the alien Mimics, he wakes up the morning before the battle. Turns out this MentalTimeTravel is a power he accidentally stole from an Alpha Mimic by contacting its blood. In the climax, Cage kills the Omega, the supreme leader of the Mimic HiveMind, though he dies in the process. But the Omega has a souped-up version of the Alphas' power, and Cage gets ''its'' blood on him before he dies. Cage wakes up back in the very first scene of the movie--but this time, the Omega is dead, and all the other Mimics with it. And Cage is the only one who remembers the erased timelines; to everyone else, it looks like the alien invaders just died spontaneously.

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* The episode of ''Series/StarTrekTheOriginalSeries'' "Recap/StarTrekS1E28TheCityOnTheEdgeOfForever" ends with this trope {{implied|trope}}, the crew find themselves on Earth in the 30's after [=McCoy=] ends up accidentally drugged and falls through a mysterious portal, which causes the Enterprise to disappear. While they look for him, they meet a beautiful woman who they eventually realise became a peace activist who delayed America's entry into WWII just long enough to lead to a BadFuture. Kirk is forced to grab [=McCoy=] when he moves to prevent her from being run over while crossing the road (as presumably happened with Bones present, but not Kirk).

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* The episode of ''Series/StarTrekTheOriginalSeries'' "Recap/StarTrekS1E28TheCityOnTheEdgeOfForever" episode [[Recap/StarTrekS1E28TheCityOnTheEdgeOfForever "City on the Edge of Forever"]] ends with this trope {{implied|trope}}, the crew find themselves on Earth in the 30's after {{implied|trope}}. When [=McCoy=] ends up accidentally gets drugged and falls through a mysterious portal through time, his changes to the timeline cause the ''Enterprise'' to disappear from the present. Kirk and Spock follow [=McCoy=] into the portal, which causes arriving in New York City in the Enterprise to disappear. While they look for him, they '30s. They meet a beautiful woman who they eventually realise became a the peace activist who delayed America's Edith Keeler, and soon realize that she's the change in the timeline. [=McCoy=] saved her (or [[TimeTravelTenseTrouble will soon save her]]) from an early death, and her activism will delay the USA's entry into WWII just long enough to lead to a BadFuture. So Kirk is forced to grab prevents [=McCoy=] when he moves to prevent her from being run over while crossing rescuing Keeler--erasing [=McCoy's=] involvement in the road (as presumably happened with Bones present, but not Kirk).past and restoring the timeline to normal.

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** In the first of the "Anthology of Interest" What If style episodes there is this trope in the context of the short. It turns out that Fry not getting frozen and getting on with his life would lead to a TimeParadox (he's much happier in the future, but he doesn't know that). Parodied when a team lead by Al Gore try to kill him under the assumption he was meant to die (with the implication that they've done this before), before realising that he was meant to be frozen. Subverted when Fry learns this, he destroys the cryogenic pod instead of being frozen, and the universe is destroyed, leaving the group to play ''TabletopGame/DungeonsAndDragons'' for the rest of eternity.
** ''WesternAnimation/{{Futurama}}'': [[Recap/FuturamaS4E10TheWhyOfFry "The Why of Fry"]] teases at this. The brain spawn's last-ditch effort to destroy the universe is to send Fry (the only person capable of stopping them) back to 1999 to prevent himself from getting cryogenically frozen--the event that kicked off the entire series. But Nibbler gives future-Fry a pep talk that convinces him that getting frozen and sent to the year 3000 is necessary. Fry instead makes a minor change that ensures he isn't in a position to be tempted by the brain spawn in the first place.

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** In the first of the [[Recap/FuturamaS2E16AnthologyOfInterestI "Anthology of Interest" What If style episodes there is this trope in Interest I"]], Fry asks the context "WhatIf" Machine what would have happened if he hadn't been cryogenically frozen in 1999--that is, if the entire premise of the short. It turns show were undone. Turns out this would cause a TimeParadox--because the future ''needs'' Fry for an unexplained reason--and this damage to the timeline attracts the attention of Al Gore and the Vice Presidential Action Squad. When they figure out that Fry not getting ''needs'' to get frozen to save the timeline, Fry disbelieves them and getting on with his life would lead to a TimeParadox (he's much happier in breaks the future, but he doesn't know that). Parodied when a team lead by Al Gore try to kill him under freezer. The temporal paradox then implodes the assumption he was meant to die (with the implication that they've done this before), before realising that he was meant to be frozen. Subverted when entire universe--stranding Fry learns this, he destroys the cryogenic pod instead of being frozen, and the universe is destroyed, leaving the group rest in a white void, with nothing to do but play play ''TabletopGame/DungeonsAndDragons'' for the rest of eternity.
** ''WesternAnimation/{{Futurama}}'': [[Recap/FuturamaS4E10TheWhyOfFry "The Why of Fry"]] teases at this. The brain spawn's last-ditch effort to destroy the universe is to send Fry (the only person capable of stopping them) back to 1999 to prevent himself from getting cryogenically frozen--the event that kicked off the entire series.frozen. But Nibbler gives future-Fry a pep talk that convinces him that getting frozen and sent to the year 3000 is necessary. Fry instead makes a minor change that ensures he isn't in a position to be tempted by the brain spawn in the first place.



* In ''WesternAnimation/TheBatman'' an episode revolves around Francis Grey, a clock-repair man who, because of his family's dire financial straits, stole an expensive watch. Leading to a cavalcade of DisasterDominoes which [[UnintentionallyNotoriousCrime landed him 20 years in prison]]. After developing TimeMaster powers and using them to lash out with an EvilPlan, he accidentally kills his son, supercharging them and going back to the moment before he stole the watch; wisely deciding to just work overtime instead. The episode ends as it began; with the bat-family discussing new years resolutions, but a clock that Alfred had trouble repairing has been fixed by none other than Francis himself. The episode ends less than a few minutes after it chronologically started with Francis returning to his van labelled "Grey and Son, watch repair" to spend Christmas with his family.

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* In ''WesternAnimation/TheBatman'' an episode revolves around Francis Grey, a clock-repair man who, because of his family's dire financial straits, stole an expensive watch. Leading This leads to a cavalcade of DisasterDominoes which [[UnintentionallyNotoriousCrime landed him 20 years in prison]]. After developing TimeMaster powers and using them to lash out with an EvilPlan, he accidentally kills his son, supercharging them son. Then he supercharges his powers and going goes back to the moment before he stole the watch; watch--this time, wisely deciding to just work overtime instead. The episode ends as it began; with the bat-family discussing new years resolutions, but a clock that Alfred had trouble repairing has been fixed by none other than Francis himself. The episode ends less than a few minutes after it chronologically started with Francis returning to his van labelled "Grey and Son, watch repair" Watch Repair" to spend Christmas with his family.
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The TheTimeTravellersDilemma is a subtrope.

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The TheTimeTravellersDilemma is a subtrope.
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The TimeTravellersDilemma is a subtrope.

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The TimeTravellersDilemma TheTimeTravellersDilemma is a subtrope.
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* In the [[Recap/DoctorWHoNSS3E12TheSoundOfDrums two]]-[[Recap/DoctorWhoNSS3E13LastOfTheTimeLords parter]] finale of Series 3 of the revival. [[ArchEnemy The Master]] had [[TheBadGuyWins succeeded]] in taking control over the entire world, trapping the Doctor in a rapid ageing state, and Martha Jones on the run on the ground. The Master accomplished this by using a psychic MindControlDevice to gradually work his way into being elected Prime Minister of Britain, before using an army of Toclafane (cyborg future human he had transported to the present) to cease control of the whole world. The Master would spend a year having his army gradually killing off the population of Earth, which was a TemporalParadox since they were killing their ancestors. This is only made possible due to the Master turning the Doctor's TARDIS into a paradox machine. The Doctor ultimately manages to defeat the Master, by having Martha travel the Earth to every human survivor (linked with the Master's psychic device) and have them [[WordPower all think his name in unison]], allowing the psychic energies to be [[EmpoweredBadassNormal granted to him]]. Once the Master is out of the way, the paradox machine is destroyed, causing the entire year of the Master's reign to reset back to before the paradox machine was activated. Only the select few people present near the machine retained memories of the year, while the rest of the population of the Earth were unaware of it occurring. This year came to be known as "The Year That Never Was".

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* ** In the [[Recap/DoctorWHoNSS3E12TheSoundOfDrums two]]-[[Recap/DoctorWhoNSS3E13LastOfTheTimeLords parter]] finale of Series 3 of the revival. [[ArchEnemy The Master]] had [[TheBadGuyWins succeeded]] in taking control over the entire world, trapping the Doctor in a rapid ageing state, and Martha Jones on the run on the ground. The Master accomplished this by using a psychic MindControlDevice to gradually work his way into being elected Prime Minister of Britain, before using an army of Toclafane (cyborg future human he had transported to the present) to cease control of the whole world. The Master would spend a year having his army gradually killing off the population of Earth, which was a TemporalParadox since they were killing their ancestors. This is only made possible due to the Master turning the Doctor's TARDIS into a paradox machine. The Doctor ultimately manages to defeat the Master, by having Martha travel the Earth to every human survivor (linked with the Master's psychic device) and have them [[WordPower all think his name in unison]], allowing the psychic energies to be [[EmpoweredBadassNormal granted to him]]. Once the Master is out of the way, the paradox machine is destroyed, causing the entire year of the Master's reign to reset back to before the paradox machine was activated. Only the select few people present near the machine retained memories of the year, while the rest of the population of the Earth were unaware of it occurring. This year came to be known as "The Year That Never Was".

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Note: Since this is still a draft, I've included spoiler tags for the benefit of TLP contributers. They will be removed on launch (Now removed in advance).

Title Suggestions:

'''[[http://tvtropes.org/pmwiki/crowner.php/AlternativeTitles/AllMustBeErased VOTE HERE]]'''

* AllMustBeErased
* PreventTheFatefulEvent
* RetconTwist
* TheDayThatNeverWas
* TheStoryThatNeverWas*
* WholePlotReset
* Ripping the Wings Off a Butterfly Effect

Indexes:
* EndingTropes
* PlotTwist

'''Draft begins below the line:'''
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Note: Since this is still a draft, I've included spoiler tags for the benefit of TLP contributers. They will be removed on launch (Now removed in advance).

Title Suggestions:

'''[[http://tvtropes.org/pmwiki/crowner.php/AlternativeTitles/AllMustBeErased VOTE HERE]]'''

* AllMustBeErased
* PreventTheFatefulEvent
* RetconTwist
* TheDayThatNeverWas
* TheStoryThatNeverWas*
* WholePlotReset
* Ripping the Wings Off a Butterfly Effect

Indexes:
* EndingTropes
* PlotTwist

'''Draft begins below the line:'''
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->''"I remember this famous episode of the original Star Trek, where Kirk has to go back in time and let the person he loves die, so the Nazis won't win the war... What kind of fucked up choice is that?"''
-->-- ''VideoGame/LifeIsStrange'', Episode 4: Dark Room, Max's Journal

Sometimes the protagonist will wake up and find out that it was AllJustADream. This is a slightly darker take that shows up in speculative fiction that deals with TimeTravel, {{Reality Warp|er}}ing and alternate realities; the events really took place, but some key ForWantOfANail near the beginning [[CosmicRetcon must be undone]] to resolve the plot's key conflict. It could be the solution to ending a GroundhogDayLoop (as opposed to getting the loop perfect), a matter of realising that a single trip was a case of MakeWrongWhatOnceWentRight, or it could just be a case of the option to RetGone everything coming up in the finale. Reasons can include BalancingDeathsBooks, preventing a TimeParadox, or simply discovering that the unintended consequences of the event in question outweigh the good it does. More often than not, the event in question is the same one that brought about said conflict, making this an odd sort of CuttingTheKnot solution.

This can be treated as utterly tragic, since it undoes CharacterDevelopment, and may even be a sadistic choice (the "nail" in question is often some sort of tragedy, such as the protagonist's death). Other times it has a slightly more optimistic spin, with it being implied that some of the nicer events that transpired will take place InSpiteOfANail (a slightly awkward scene of the main character befriending a character, especially a LoveInterest, who they no longer know is a popular one). In worse cases, it might even be AllForNothing, with it implied that the catastrophe that was averted could easily happen again (and the next people to experience it might be more selfish).

The thing that it turns out must be reversed to retcon away the events is typically an IncitingIncident.

Writers must be quite careful with this trope, since as with All Just A Dream, it runs the risk of making it seem like the entire plot was pointless. This is avoidable if a RippleEffectProofMemory allows them to retain CharacterDevelopment (although, this invokes a bit of FridgeLogic if the issue was that time travel inherently damaged the timeline; something's changed either way) or otherwise benefit in some metaphysical way which prevents the audience from feeling cheated, or if the entire plot involved multiple loops anyway (so the audience is used to large chunks of plot not being canon in the main timeline).

Compare SetRightWhatOnceWentWrong, where undoing a specific event is the overall goal (which might lead to this trope), TheGreatestStoryNeverTold (which happened, but was simply kept secret) and ResetButtonEnding, which returns the work to its {{Status Quo|IsGod}} without resolving the conflict on its own (and doesn't always include a CosmicRetcon). Contrast AllJustADream, where the events are revealed to simply never have happened, LeaveYourQuestTest where undoing everything would be seen as a copout on the heroes' part, and StableTimeLoop, where changes to the timeline are either inevitable or meshed in perfectly (although it's still possible to run into the "bad outweighs the good" problem).

Not to be confused with WhatCouldHaveBeen.

'''As an {{Ending Trope|s}}, [[Administrivia/HandlingSpoilers all spoilers on this page are unmarked]].'''
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!Examples:
[[foldercontrol]]

[[folder:Comics]]
* In ''ComicBook/TheInfinityGauntlet'' saga, ComicBook/{{Thanos}} managed to get the Infinity Gauntlet, a powerful AppliedPhlebotinum that can modify everything, so he erased the half of sentient life of the universe to please Ms. Death, among other things like defeating the Cosmic Entities of the ComicBook/MarvelUniverse. After the battle against the Mad God, finally Adam Warlock got the infinity Gauntlet from Thanos and used to SetRightWhatOnceWentWrong by restoring all the lifes lost in the event (not just the ones erased by Thanos, also the deaths of heroes battling Thanos) and also managed to get everyone in the universe that was AllJustADream.
[[/folder]]

[[folder:Fan Fiction]]
* ''[[https://www.fimfiction.net/story/348928/quantum-starlight Quantum Starlight]]'' (a ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fanfic and WholePlotReference to ''VideoGame/QuantumBreak''): an accident during the first test of a time machine causes time itself to fracture, leading to a whole mess of unchangeable {{Stable Time Loop}}s and the looming threat of a TimeCrash. And then the protagonists find a method of time travel that ''does'' allow them to change the past, so they go back and stop the original accident. The majority of the plot is erased from the timeline, but the time travelers retain their memories of events retconned away.
[[/folder]]

[[folder:Film -- Live Action]]
* At the end of ''Film/TheButterflyEffect'', the protagonist decides that the only way he can stop screwing things up with his MentalTimeTravel is to jump back to before he was born, and strangle himself in his mother's womb; deleted scenes imply he wasn't even the first of his mother's children to go through this.
* ''Film/{{Primer}}'': when the power of TimeTravel proves too dangerous and too confusing for anyone to use, Abe Terger travels back as far as he can and interferes with his past self's experiments, hoping to stop the past versions of himself and Aaron from pursuing time travel any further. The future versions of Abe and Aaron, who went through all that character development, continue existing--since time travel in ''Primer'' results in the travelers cloning themselves unless they're careful to maintain a StableTimeLoop.
* Not in an "Old Testament kind of mood" at the time, God in ''Film/JesusBro'' decides to undo [[CaughtUpInTheRapture the rapture]] and the various deaths caused by Rick, Santa Christ and the Devil's actions in the film by resetting everything to before Elizabeth breaks up with Rick. Subverted, in that Santa Christ returns Rick's memories of everything that happened shortly after.
* In the finale of ''Film/DonnieDarko'', the titular protagonist goes back in time ([[MindScrew somehow]]) and allows himself to be hit by the falling airplane engine that had missed him in the beginning, in order to change the sequence of events that led to his girlfriend being run over by a car.
[[/folder]]

[[folder:Film -- Animated]]
* Lewis Robinson of Disney's ''Disney/MeetTheRobinsons'' discovers the far future is an ugly {{dystopia}} where humanity is a SlaveRace to mechanized overlords. Learning that it's one of his inventions that went rogue and begat this dystopia, Lewis gives a DeathGlare to the CyberCyclops BigBad and delivers the scathing PreMortemOneLiner "... and I'm not inventing you!" Whereupon the device dissolves from existence, just before Lewis exploits the TimeyWimeyBall to SetRightWhatOnceWentWrong.
[[/folder]]

[[folder:Literature]]
* ''Literature/{{Goosebumps}}: Be Careful What You Wish For'': Samatha Byrd gets a gift of three wishes from the witch Clarissa. But, [[BeCarefulWhatYouWishFor as expected]], all these wishes come with terrible side effects. At the end, Samatha's uses her final request to wish that she had never met Clarissa.
* ''Literature/{{Animorphs}}''
** In the Megamorphs novel "Elfangor's Secret", Visser Four has used the Time Matrix to alter key events in human history to make the Yeerk invasion much easier. In order to undo the changes to the timeline (and Jake's death), the Animorphs ensure that Visser Four's host, John Berryman, was never born by preventing his parents from meeting, thus ensuring that Visser Four was never able to alter the timeline to begin with.
** In "The Forgotten", the Animorphs decide to steal a Yeerk Bug fighter in order to fly it to the White House and expose the Yeerk invasion, but an accident results in an anomaly known as a ''Sario Rip'' being created, where two alternate versions of each person involved exists at the same time and will be eliminated at a specific time, and also results in the Animorphs getting trapped in the Amazon rainforest along with Visser Three and his underlings. However, Jake gets killed by Visser Three before that time, thus returning him to the exact moment when he made the decision to steal the Bug fighter (as he is apparently the only real person there, as he's the only one to have vivid flashbacks to before his decision throughout the novel). This time, he decides not to go through with it.
* In Creator/DavidEddings' ''Dreamers'' tetralogy, the fourth book describes a DeusExMachina that one-ups the {{Physical God}}s already present as viewpoint characters: the two {{amnesiac|God}} [[TheOldGods Old Gods]] remember their powers, effortlessly neutralize the BigBad, and make their victory retroactive so the plot of the series never happened. {{Lampshade|Hanging}}d, even, when they make a passing comment on all the CharacterDevelopment that they unmade.
[[/folder]]

[[folder:Live Action Television]]
* The episode of ''Series/StarTrekTheOriginalSeries'' "Recap/StarTrekS1E28TheCityOnTheEdgeOfForever" ends with this trope {{implied|trope}}, the crew find themselves on Earth in the 30's after [=McCoy=] ends up accidentally drugged and falls through a mysterious portal, which causes the Enterprise to disappear. While they look for him, they meet a beautiful woman who they eventually realise became a peace activist who delayed America's entry into WWII just long enough to lead to a BadFuture. Kirk is forced to grab [=McCoy=] when he moves to prevent her from being run over while crossing the road (as presumably happened with Bones present, but not Kirk).
* In ''Series/LegendsOfTomorrow'' Season 2, after the Legends spend most of the season trying to keep the Spear of Destiny out of the hands of the LegionOfDoom, ultimately they fail and the Legion uses the Spear to rewrite reality. Even trapped within the Legion's Doomworld reality, the Legends make a final attempt to steal back the spear and undo the damage, only for Eobard Thawne to destroy the spear itself. The Legends then reason that the only way to repair reality is to stop the Legion from getting the Spear to begin with, so they travel back in time across their own personal history to WWI where the Legion had first acquired the completed Spear. In a FinalBattle of the Legends teaming up with their past selves to face the Legion, all of the future Legends end up being killed with the exception of Sara. Sara then uses the Spear's reality powers to disable its own reality warping ''before'' the Legion would use it, thus preventing the Legion from ever creating the Doomworld to begin with and restoring reality to its correct nature.
* ''Series/StarTrekVoyager'': In a season-one episode, there's a time paradox centered on a polaron-based power grid on a pre-warp civilization's planet in the Delta Quadrant. Tom Paris and Captain Janeway end up falling through a hole in time that was caused by the power grid's accidental detonation. The twist is that the future-Voyager-crew's own attempt to rescue Paris and Janeway is what ''caused'' the detonation, and Janeway realizing this and using a phaser to stop the rescue attempt resets the timeline, preventing the detonation and in turn preventing them from going back in time in the first place.
* In ''Series/DoctorWho'',
** In "[[Recap/DoctorWhoS27E8FathersDay Father's Day]]", the Doctor takes Rose Tyler back to the day where her father, Pete, was killed so she could share one last moment with him just before he dies. However Rose disobeys the Doctor and saves her father's life by pushing him out of the way of the car that would kill him. As this was a fixed point in time, changing it causes catastrophic events on the world with the [[ClockRoaches Reapers of Time]] being released to deal with the paradox. Ultimately, the one way to fix the anomaly is to have Pete relive the event that was changed and get hit by the car that would have killed him. Accepting his fate as the only way to restore time, Pete walks in front of the car and gets killed, erasing all of the alternate timeline that occurred due to the paradox.
** In "[[Recap/DoctorWhoS33E10JourneyToTheCentreOfTheTardis Journey to the Centre of the TARDIS]]", the TARDIS takes damage from a salvaging ship's magnetic cobble field. This causes all sorts of problems including Clara being trapped inside, moments from time seeping out, and zombie creatures roaming about the ship. Then to top it all off the TARDIS core is revealed to have hit critical and will eventually explode, with the zombie creatures revealed to be future versions of the TARDIS crew who had their flesh burned up and melted by the TARDIS. The Doctor eventually figures out the one way to repair the damage is to prevent the entire day from happening to begin with, which he does so by reaching through one of the tears in time to the point where the TARDIS got caught in the field and passes his past self the button to turn off the magnetic field, effectively erasing the entire day.
* In the [[Recap/DoctorWHoNSS3E12TheSoundOfDrums two]]-[[Recap/DoctorWhoNSS3E13LastOfTheTimeLords parter]] finale of Series 3 of the revival. [[ArchEnemy The Master]] had [[TheBadGuyWins succeeded]] in taking control over the entire world, trapping the Doctor in a rapid ageing state, and Martha Jones on the run on the ground. The Master accomplished this by using a psychic MindControlDevice to gradually work his way into being elected Prime Minister of Britain, before using an army of Toclafane (cyborg future human he had transported to the present) to cease control of the whole world. The Master would spend a year having his army gradually killing off the population of Earth, which was a TemporalParadox since they were killing their ancestors. This is only made possible due to the Master turning the Doctor's TARDIS into a paradox machine. The Doctor ultimately manages to defeat the Master, by having Martha travel the Earth to every human survivor (linked with the Master's psychic device) and have them [[WordPower all think his name in unison]], allowing the psychic energies to be [[EmpoweredBadassNormal granted to him]]. Once the Master is out of the way, the paradox machine is destroyed, causing the entire year of the Master's reign to reset back to before the paradox machine was activated. Only the select few people present near the machine retained memories of the year, while the rest of the population of the Earth were unaware of it occurring. This year came to be known as "The Year That Never Was".
* At the climax of the ''Series/{{Farscape}}'' episode "The Locket", the central characters are forced to use the strange properties of the NegativeSpaceWedgie that they are trapped in to reverse time and change history so that they never entered it. One of the two characters with a RippleEffectProofMemory who remember this feels guilt that they might have erased a number of people who were conceived and born thanks to one of the crew having children on a planet on the other side of the anomaly, but the other speculates that they might have split the timeline instead of erasing it.

[[/folder]]

[[folder:Video Game]]
* As well as referencing the Star Trek example (as seen in the page quote), ''VideoGame/LifeIsStrange'' has this twice itself; at the beginning of chapter 4, and for the entire game.
**Max realises she can jump back in time via photos (as well as just reversing it briefly as is done in normal gameplay) and tries to fix the death of Chloe's [[GoodParents near angelic father]]. In the new timeline Chloe suffered a car accident instead and is dying a slow, painful death while confined to a wheelchair, suffering many of the bad things that were previously caused by her father's death[[note]]kicked out of school because they can't accommodate her rather than delinquency, the family are on the verge of poverty because of medical bills despite her father's job, Max still moved away (and seems socially isolated at school as an AlphaBitch instead of a wallflower) and all the mysterious events they were investigating -- including the random death of animals, freak weather events and the disappearance of Rachel (who Chloe never met) -- are still happening[[/note]], culminating in a choice of whether you [[ICannotSelfTerminate kill her with an overdose]] at her own request, or not. This is finally enough to make Max restore the original timeline, where Chloe is miserable and went through hell for the last 5 years, but still alive. The entire scene is effectively foreshadowing for the endings...
** You first see Chloe when she's shot by Nathan, causing Max to manifest her TimeMaster powers and undo it in a JustifiedTutorial. At the end of episode 5/Season 1 you have a SadisticChoice of endings; "Sacrifice Chloe" or "Sacrifice Arcadia Bay". The former follows this trope, Max goes back in time (via a photo you took just before it happened) to let her get shot and DyingAlone (as far as she knows), never to be reunited with the former best friend crying her eyes out just feet away. A montage reveals that this also solves most of the story's other conflicts.[[note]]Nathan sells out Jefferson after being arrested for her murder (and presumably gets the care he needs), the Prescotts are being investigated for their involvement, Rachel's body is discovered shortly after as a result and Kate never attempts suicide, as the much larger scandal prevents the video of her going viral (and/or the arrest of Nathan making it clear she was a victim).[[/note]]
** The other ending subverts this trope ([[BuryYourGays as well as another]]). Max tears the photo up (echoing an earlier moment when she destroys her prize winning photo to retcon herself back to the town and be able to save Chloe), having decided to ScrewDestiny and let the storm that this damage to the timeline summoned destroy the town (with a ShrugOfGod as to how many survivors there are). After it subsides an unspecified amount of time later, Max and Chloe leave the ruined town together, moving on with their lives.
* ''VideoGame/DeponiaDoomsday'' has a tangled story with time travel, time resetting and time loops that ultimately ends with Rufus convincing everybody that the tragic end of the previous game is the best option.
* ''VideoGame/{{Bastion}}'' has two endings. One is to leave the broken land and the other is to reset to before the calamity, without knowing if it will repeat or not. It's heavily hinted that it does indeed repeat (serving as an InUniverse explanation for a NewGamePlus).
* ''VisualNovel/SuperDanganronpa2'' is all a computer simulation to retrain everyone to be better people. Well, at least that was the plan before Monokuma showed up and hijacked everything. A large part of the finale is about how to proceed with the situation, either undoing it all or letting the villain win. Despite all intents and plans, the reset turns out to ''somehow'' allow everyone to retain their memories and character developments, despite the timeline being thrown out.
* ''VideoGame/GhostTrick'' ends with going back to WhenItAllBegan and undoing the initial death, erasing the entire timeline from that point forwards.
* ''VideoGame/SonicTheHedgehog2006'' involved lots of time travel, and Dr. Eggman trying to harness the power of the god Solaris to conquer everything. Predictably, Solaris gets out of control and destroys almost all of time and space before Sonic and friends can stop him. The final cutscene involves one last bit of time travel, in which where Sonic and Elise extinguish the flame of Solaris, thereby preventing the lab accident that set the entire plot in motion. As the rest of the game wasn't very good, Sonic fans didn't particularly mind that it ended by erasing itself from the series timeline.
* At the end of ''VideoGame/TheLegendOfZeldaOcarinaOfTime'', Zelda resets the timeline to just before Link met her and she sent him of to try to stop Ganndorf on his own. They realize that Ganondorf would've never have risen to power if they had simply turned him over to the proper authorities instead of unlocking the sacred realm giving him the opportunity to steal the triforce. She also apologizes that all the time travel shenanigans deprived Link of a normal childhood. In doing so she actually failed to fully erase everything and created at least two timelines - one where Link simply vanished from existence after defeating Ganon as an adult, and one where he exposed the conspiracy as a child. WordOfGod is that despite being able to live out his childhood, Link retained memories of the events of the plot and lived an unfulfilled life because he never got to be the Hero of Time.
* The original ''[[VideoGame/FinalFantasyI Final Fantasy]]'' saw this happen upon the Light Warriors destroying Chaos and ending the cycle of Garland going back in time to become him. However, it is stated that their deeds at least live on in legend, and their own memories.
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[[folder:Western Animation]]
* ''WesternAnimation/{{Futurama}}'':
** In the first of the "Anthology of Interest" What If style episodes there is this trope in the context of the short. It turns out that Fry not getting frozen and getting on with his life would lead to a TimeParadox (he's much happier in the future, but he doesn't know that). Parodied when a team lead by Al Gore try to kill him under the assumption he was meant to die (with the implication that they've done this before), before realising that he was meant to be frozen. Subverted when Fry learns this, he destroys the cryogenic pod instead of being frozen, and the universe is destroyed, leaving the group to play ''TabletopGame/DungeonsAndDragons'' for the rest of eternity.
** ''WesternAnimation/{{Futurama}}'': [[Recap/FuturamaS4E10TheWhyOfFry "The Why of Fry"]] teases at this. The brain spawn's last-ditch effort to destroy the universe is to send Fry (the only person capable of stopping them) back to 1999 to prevent himself from getting cryogenically frozen--the event that kicked off the entire series. But Nibbler gives future-Fry a pep talk that convinces him that getting frozen and sent to the year 3000 is necessary. Fry instead makes a minor change that ensures he isn't in a position to be tempted by the brain spawn in the first place.
* In the ''WesternAnimation/FamilyGuy'' episode "Back to the Pilot", Brian asks for Stewie's help in finding a lost tennis ball. Stewie agrees to take Brian back in time so he can see the location, but Brian fails to listen ends up telling his past self about the 9/11 attacks. This results in an apocalyptic BadFuture from the result of nuclear attacks. After multiple trips result in [[MesACrowd dozens of Stewies and Brians]] from the future arguing it out on whether or not to prevent 9/11, one of the Stewies decides to hold a vote. Upon the majority agreeing to allow 9/11 to happen, this Stewie and Brian then travel one minute back in time to the very first point they arrived via time travel, before they made ''any'' changes. Stewie then draws a gun on the past Stewie and Brian and forces them to go back to the present. By doing so, Stewie managed to [[CosmicRetcon erase the entire timeline]] created by the time travel along with this version of Brian and Stewie.
* In ''the WesternAnimation/JusticeLeague'' episode "[[Recap/JusticeLeagueUnlimitedS1E13TimeWarped Time, Warped]]", Batman tampers with the villain's time travel belt so that instead of going on his time traveling crime spree, as he did at the beginning of the previous episode, it locks him in a time loop at the point where he would have started.
* In ''WesternAnimation/TheBatman'' an episode revolves around Francis Grey, a clock-repair man who, because of his family's dire financial straits, stole an expensive watch. Leading to a cavalcade of DisasterDominoes which [[UnintentionallyNotoriousCrime landed him 20 years in prison]]. After developing TimeMaster powers and using them to lash out with an EvilPlan, he accidentally kills his son, supercharging them and going back to the moment before he stole the watch; wisely deciding to just work overtime instead. The episode ends as it began; with the bat-family discussing new years resolutions, but a clock that Alfred had trouble repairing has been fixed by none other than Francis himself. The episode ends less than a few minutes after it chronologically started with Francis returning to his van labelled "Grey and Son, watch repair" to spend Christmas with his family.
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